#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <assert.h>
#include "appnet_sds.h"
#include "zmalloc.h"

/* Create a new sds string with the content specified by the 'init' pointer
 * and 'initlen'.
 * If NULL is used for 'init' the string is initialized with zero bytes.
 *
 * The string is always null-termined (all the sds strings are, always) so
 * even if you create an sds string with:
 *
 * mystring = sdsnewlen("abc",3);
 *
 * You can print the string with printf() as there is an implicit \0 at the
 * end of the string. However the string is binary safe and can contain
 * \0 characters in the middle, as the length is stored in the sds header. */
sds sdsnewlen( const void *init , size_t initlen )
{
	struct sdshdr *sh;
	if (init)
	{
		sh = zmalloc( sizeof(struct sdshdr) + initlen + 1 );
	}
	else
	{
		sh = zcalloc( sizeof(struct sdshdr) + initlen + 1 );
	}
	if (sh == NULL)
	{
		return NULL;
	}
	sh->len = initlen;
	sh->free = 0;
	if (initlen && init)
	{
		memcpy( sh->buf , init , initlen );
	}
	sh->buf[initlen] = '\0';
	return (char*) sh->buf;
}

/* Create an empty (zero length) sds string. Even in this case the string
 * always has an implicit null term. */
sds sdsempty( void )
{
	return sdsnewlen( "" , 0 );
}

/* Create a new sds string starting from a null terminated C string. */
sds sdsnew( const char *init )
{
	size_t initlen = ( init == NULL ) ? 0 : strlen( init );
	return sdsnewlen( init , initlen );
}

/* Duplicate an sds string. */
sds sdsdup( const sds s )
{
	return sdsnewlen( s , sdslen( s ) );
}

/* Free an sds string. No operation is performed if 's' is NULL. */
void sdsfree( sds s )
{
	if (s == NULL)
	{
		return;
	}
	zfree( s - sizeof(struct sdshdr) );
}

/* Set the sds string length to the length as obtained with strlen(), so
 * considering as content only up to the first null term character.
 *
 * This function is useful when the sds string is hacked manually in some
 * way, like in the following example:
 *
 * s = sdsnew("foobar");
 * s[2] = '\0';
 * sdsupdatelen(s);
 * printf("%d\n", sdslen(s));
 *
 * The output will be "2", but if we comment out the call to sdsupdatelen()
 * the output will be "6" as the string was modified but the logical length
 * remains 6 bytes. */
void sdsupdatelen( sds s )
{
	struct sdshdr *sh = (void*) ( s - ( sizeof(struct sdshdr) ) );
	int reallen = strlen( s );
	sh->free += ( sh->len - reallen );
	sh->len = reallen;
}

/* Modify an sds string in-place to make it empty (zero length).
 * However all the existing buffer is not discarded but set as free space
 * so that next append operations will not require allocations up to the
 * number of bytes previously available. */
void sdsclear( sds s )
{
	struct sdshdr *sh = (void*) ( s - ( sizeof(struct sdshdr) ) );
	sh->free += sh->len;
	sh->len = 0;
	sh->buf[0] = '\0';
}

/* Enlarge the free space at the end of the sds string so that the caller
 * is sure that after calling this function can overwrite up to addlen
 * bytes after the end of the string, plus one more byte for nul term.
 *
 * Note: this does not change the *length* of the sds string as returned
 * by sdslen(), but only the free buffer space we have. */
sds sdsMakeRoomFor( sds s , size_t addlen )
{
	struct sdshdr *sh,*newsh;
	size_t free = sdsavail( s );
	size_t len,newlen;
	if (free >= addlen)
	{
		return s;
	}
	len = sdslen( s );
	sh = (void*) ( s - ( sizeof(struct sdshdr) ) );
	newlen = ( len + addlen );
	if (newlen < SDS_MAX_PREALLOC )
	{
		newlen *= 2;
	}
	else
	{
		newlen += SDS_MAX_PREALLOC;
	}
	newsh = zrealloc( sh , sizeof(struct sdshdr) + newlen + 1 );
	if (newsh == NULL)
	{
		return NULL;
	}
	newsh->free = newlen - len;
	return newsh->buf;
}

/* Reallocate the sds string so that it has no free space at the end. The
 * contained string remains not altered, but next concatenation operations
 * will require a reallocation.
 *
 * After the call, the passed sds string is no longer valid and all the
 * references must be substituted with the new pointer returned by the call. */
sds sdsRemoveFreeSpace( sds s )
{
	struct sdshdr *sh;
	sh = (void*) ( s - ( sizeof(struct sdshdr) ) );
	sh = zrealloc( sh , sizeof(struct sdshdr) + sh->len + 1 );
	sh->free = 0;
	return sh->buf;
}

/* Return the total size of the allocation of the specifed sds string,
 * including:
 * 1) The sds header before the pointer.
 * 2) The string.
 * 3) The free buffer at the end if any.
 * 4) The implicit null term.
 */
size_t sdsAllocSize( sds s )
{
	struct sdshdr *sh = (void*) ( s - ( sizeof(struct sdshdr) ) );
	return sizeof( *sh ) + sh->len + sh->free + 1;
}

/* Increment the sds length and decrements the left free space at the
 * end of the string according to 'incr'. Also set the null term
 * in the new end of the string.
 *
 * This function is used in order to fix the string length after the
 * user calls sdsMakeRoomFor(), writes something after the end of
 * the current string, and finally needs to set the new length.
 *
 * Note: it is possible to use a negative increment in order to
 * right-trim the string.
 *
 * Usage example:
 *
 * Using sdsIncrLen() and sdsMakeRoomFor() it is possible to mount the
 * following schema, to cat bytes coming from the kernel to the end of an
 * sds string without copying into an intermediate buffer:
 *
 * oldlen = sdslen(s);
 * s = sdsMakeRoomFor(s, BUFFER_SIZE);
 * nread = read(fd, s+oldlen, BUFFER_SIZE);
 * ... check for nread <= 0 and handle it ...
 * sdsIncrLen(s, nread);
 */
void sdsIncrLen( sds s , int incr )
{
	struct sdshdr *sh = (void*) ( s - ( sizeof(struct sdshdr) ) );
	if (incr >= 0)
	{
		assert( sh->free >= (unsigned int) incr );
	}
	else
	{
		assert( sh->len >= (unsigned int) ( -incr ) );
	}
	sh->len += incr;
	sh->free -= incr;
	s[sh->len] = '\0';
}

/* Grow the sds to have the specified length. Bytes that were not part of
 * the original length of the sds will be set to zero.
 *
 * if the specified length is smaller than the current length, no operation
 * is performed. */
sds sdsgrowzero( sds s , size_t len )
{
	struct sdshdr *sh = (void*) ( s - ( sizeof(struct sdshdr) ) );
	size_t totlen,curlen = sh->len;
	if (len <= curlen)
	{
		return s;
	}
	s = sdsMakeRoomFor( s , len - curlen );
	if (s == NULL)
	{
		return NULL;
	}
	/* Make sure added region doesn't contain garbage */
	sh = (void*) ( s - ( sizeof(struct sdshdr) ) );
	memset( s + curlen , 0 , ( len - curlen + 1 ) ); /* also set trailing \0 byte */
	totlen = sh->len + sh->free;
	sh->len = len;
	sh->free = totlen - sh->len;
	return s;
}

/* Append the specified binary-safe string pointed by 't' of 'len' bytes to the
 * end of the specified sds string 's'.
 *
 * After the call, the passed sds string is no longer valid and all the
 * references must be substituted with the new pointer returned by the call. */
sds sdscatlen( sds s , const void *t , size_t len )
{
	struct sdshdr *sh;
	size_t curlen = sdslen( s );
	s = sdsMakeRoomFor( s , len );
	if (s == NULL)
	{
		return NULL;
	}
	sh = (void*) ( s - ( sizeof(struct sdshdr) ) );
	memcpy( s + curlen , t , len );
	sh->len = curlen + len;
	sh->free = sh->free - len;
	s[curlen + len] = '\0';
	return s;
}

/* Append the specified null termianted C string to the sds string 's'.
 *
 * After the call, the passed sds string is no longer valid and all the
 * references must be substituted with the new pointer returned by the call. */
sds sdscat( sds s , const char *t )
{
	return sdscatlen( s , t , strlen( t ) );
}

/* Append the specified sds 't' to the existing sds 's'.
 *
 * After the call, the modified sds string is no longer valid and all the
 * references must be substituted with the new pointer returned by the call. */
sds sdscatsds( sds s , const sds t )
{
	return sdscatlen( s , t , sdslen( t ) );
}

/* Destructively modify the sds string 's' to hold the specified binary
 * safe string pointed by 't' of length 'len' bytes. */
sds sdscpylen( sds s , const char *t , size_t len )
{
	struct sdshdr *sh = (void*) ( s - ( sizeof(struct sdshdr) ) );
	size_t totlen = sh->free + sh->len;
	if (totlen < len)
	{
		s = sdsMakeRoomFor( s , len - sh->len );
		if (s == NULL)
		{
			return NULL;
		}
		sh = (void*) ( s - ( sizeof(struct sdshdr) ) );
		totlen = sh->free + sh->len;
	}
	memcpy( s , t , len );
	s[len] = '\0';
	sh->len = len;
	sh->free = totlen - len;
	return s;
}

/* Like sdscpylen() but 't' must be a null-termined string so that the length
 * of the string is obtained with strlen(). */
sds sdscpy( sds s , const char *t )
{
	return sdscpylen( s , t , strlen( t ) );
}

/* Helper for sdscatlonglong() doing the actual number -> string
 * conversion. 's' must point to a string with room for at least
 * SDS_LLSTR_SIZE bytes.
 *
 * The function returns the length of the null-terminated string
 * representation stored at 's'. */
#define SDS_LLSTR_SIZE 21
int sdsll2str( char *s , long long value )
{
	char *p,aux;
	unsigned long long v;
	size_t l;
	/* Generate the string representation, this method produces
	 * an reversed string. */
	v = ( value < 0 ) ? -value : value;
	p = s;
	do
	{
		*p++ = '0' + ( v % 10 );
		v /= 10;
	}
	while (v);
	if (value < 0)
	{
		*p++ = '-';
	}
	/* Compute length and add null term. */
	l = p - s;
	*p = '\0';
	/* Reverse the string. */
	p--;
	while (s < p)
	{
		aux = *s;
		*s = *p;
		*p = aux;
		s++;
		p--;
	}
	return l;
}

/* Identical sdsll2str(), but for unsigned long long type. */
int sdsull2str( char *s , unsigned long long v )
{
	char *p,aux;
	size_t l;
	/* Generate the string representation, this method produces
	 * an reversed string. */
	p = s;
	do
	{
		*p++ = '0' + ( v % 10 );
		v /= 10;
	}
	while (v);
	/* Compute length and add null term. */
	l = p - s;
	*p = '\0';
	/* Reverse the string. */
	p--;
	while (s < p)
	{
		aux = *s;
		*s = *p;
		*p = aux;
		s++;
		p--;
	}
	return l;
}

/* Create an sds string from a long long value. It is much faster than:
 *
 * sdscatprintf(sdsempty(),"%lld\n", value);
 */
sds sdsfromlonglong( long long value )
{
	char buf[SDS_LLSTR_SIZE];
	int len = sdsll2str( buf , value );
	return sdsnewlen( buf , len );
}

/* Like sdscatprintf() but gets va_list instead of being variadic. */
sds sdscatvprintf( sds s , const char *fmt , va_list ap )
{
	va_list cpy;
	char staticbuf[1024],*buf = staticbuf,*t;
	size_t buflen = strlen( fmt ) * 2;
	/* We try to start using a static buffer for speed.
	 * If not possible we revert to heap allocation. */
	if (buflen > sizeof( staticbuf ))
	{
		buf = zmalloc( buflen );
		if (buf == NULL)
		{
			return NULL;
		}
	}
	else
	{
		buflen = sizeof( staticbuf );
	}
	/* Try with buffers two times bigger every time we fail to
	 * fit the string in the current buffer size. */
	while (1)
	{
		buf[buflen - 2] = '\0';
		va_copy( cpy , ap );
		vsnprintf( buf , buflen , fmt , cpy );
		va_end( cpy );
		if (buf[buflen - 2] != '\0')
		{
			if (buf != staticbuf)
			{
				zfree( buf );
			}
			buflen *= 2;
			buf = zmalloc( buflen );
			if (buf == NULL)
			{
				return NULL;
			}
			continue;
		}
		break;
	}
	/* Finally concat the obtained string to the SDS string and return it. */
	t = sdscat( s , buf );
	if (buf != staticbuf)
	{
		zfree( buf );
	}
	return t;
}

/* Append to the sds string 's' a string obtained using printf-alike format
 * specifier.
 *
 * After the call, the modified sds string is no longer valid and all the
 * references must be substituted with the new pointer returned by the call.
 *
 * Example:
 *
 * s = sdsnew("Sum is: ");
 * s = sdscatprintf(s,"%d+%d = %d",a,b,a+b).
 *
 * Often you need to create a string from scratch with the printf-alike
 * format. When this is the need, just use sdsempty() as the target string:
 *
 * s = sdscatprintf(sdsempty(), "... your format ...", args);
 */
sds sdscatprintf( sds s , const char *fmt , ... )
{
	va_list ap;
	char *t;
	va_start( ap , fmt );
	t = sdscatvprintf( s , fmt , ap );
	va_end( ap );
	return t;
}

/* This function is similar to sdscatprintf, but much faster as it does
 * not rely on sprintf() family functions implemented by the libc that
 * are often very slow. Moreover directly handling the sds string as
 * new data is concatenated provides a performance improvement.
 *
 * However this function only handles an incompatible subset of printf-alike
 * format specifiers:
 *
 * %s - C String
 * %S - SDS string
 * %i - signed int
 * %I - 64 bit signed integer (long long, int64_t)
 * %u - unsigned int
 * %U - 64 bit unsigned integer (unsigned long long, uint64_t)
 * %% - Verbatim "%" character.
 */
sds sdscatfmt( sds s , char const *fmt , ... )
{
	struct sdshdr *sh = (void*) ( s - ( sizeof(struct sdshdr) ) );
	size_t initlen = sdslen( s );
	const char *f = fmt;
	int i;
	va_list ap;
	va_start( ap , fmt );
	f = fmt; /* Next format specifier byte to process. */
	i = initlen; /* Position of the next byte to write to dest str. */
	while (*f)
	{
		char next,*str;
		unsigned int l;
		long long num;
		unsigned long long unum;
		/* Make sure there is always space for at least 1 char. */
		if (sh->free == 0)
		{
			s = sdsMakeRoomFor( s , 1 );
			sh = (void*) ( s - ( sizeof(struct sdshdr) ) );
		}
		switch (*f)
		{
			case '%':
				next = *( f + 1 );
				f++;
				switch (next)
				{
					case 's':
						case 'S':
												str = va_arg(ap,char*);
						l = ( next == 's' ) ? strlen( str ) : sdslen( str );
						if (sh->free < l)
						{
							s = sdsMakeRoomFor( s , l );
							sh = (void*) ( s - ( sizeof(struct sdshdr) ) );
						}
						memcpy( s + i , str , l );
						sh->len += l;
						sh->free -= l;
						i += l;
					break;
					case 'i':
						case 'I':
						if (next == 'i')
						{
						num = va_arg(ap,int);
					}
					else
					{
					num = va_arg(ap,long long);
				}
				{
					char buf[SDS_LLSTR_SIZE];
					l = sdsll2str( buf , num );
					if (sh->free < l)
					{
						s = sdsMakeRoomFor( s , l );
						sh = (void*) ( s - ( sizeof(struct sdshdr) ) );
					}
					memcpy( s + i , buf , l );
					sh->len += l;
					sh->free -= l;
					i += l;
				}
			break;
			case 'u':
				case 'U':
				if (next == 'u')
				{
				unum = va_arg(ap,unsigned int);
			}
			else
			{
			unum = va_arg(ap,unsigned long long);
		}
		{
			char buf[SDS_LLSTR_SIZE];
			l = sdsull2str( buf , unum );
			if (sh->free < l)
			{
				s = sdsMakeRoomFor( s , l );
				sh = (void*) ( s - ( sizeof(struct sdshdr) ) );
			}
			memcpy( s + i , buf , l );
			sh->len += l;
			sh->free -= l;
			i += l;
		}
	break;
	default: /* Handle %% and generally %<unknown>. */
		s[i++] = next;
		sh->len += 1;
		sh->free -= 1;
	break;
	}
break;
default:
	s[i++] = *f;
	sh->len += 1;
	sh->free -= 1;
break;
}
f++;
}
va_end( ap );
/* Add null-term */
s[i] = '\0';
return s;
}

/* Remove the part of the string from left and from right composed just of
 * contiguous characters found in 'cset', that is a null terminted C string.
 *
 * After the call, the modified sds string is no longer valid and all the
 * references must be substituted with the new pointer returned by the call.
 *
 * Example:
 *
 * s = sdsnew("AA...AA.a.aa.aHelloWorld     :::");
 * s = sdstrim(s,"Aa. :");
 * printf("%s\n", s);
 *
 * Output will be just "Hello World".
 */
sds sdstrim( sds s , const char *cset )
{
struct sdshdr *sh = (void*) ( s - ( sizeof(struct sdshdr) ) );
char *start,*end,*sp,*ep;
size_t len;
sp = start = s;
ep = end = s + sdslen( s ) - 1;
while (sp <= end && strchr( cset , *sp ))
{
sp++;
}
while (ep > start && strchr( cset , *ep ))
{
ep--;
}
len = ( sp > ep ) ? 0 : ( ( ep - sp ) + 1 );
if (sh->buf != sp)
{
memmove( sh->buf , sp , len );
}
sh->buf[len] = '\0';
sh->free = sh->free + ( sh->len - len );
sh->len = len;
return s;
}

/* Turn the string into a smaller (or equal) string containing only the
 * substring specified by the 'start' and 'end' indexes.
 *
 * start and end can be negative, where -1 means the last character of the
 * string, -2 the penultimate character, and so forth.
 *
 * The interval is inclusive, so the start and end characters will be part
 * of the resulting string.
 *
 * The string is modified in-place.
 *
 * Example:
 *
 * s = sdsnew("Hello World");
 * sdsrange(s,1,-1); => "ello World"
 */
void sdsrange( sds s , int start , int end )
{
struct sdshdr *sh = (void*) ( s - ( sizeof(struct sdshdr) ) );
size_t newlen,len = sdslen( s );
if (len == 0)
{
return;
}
if (start < 0)
{
start = len + start;
if (start < 0)
{
	start = 0;
}
}
if (end < 0)
{
end = len + end;
if (end < 0)
{
	end = 0;
}
}
newlen = ( start > end ) ? 0 : ( end - start ) + 1;
if (newlen != 0)
{
if (start >= (signed) len)
{
	newlen = 0;
}
else if (end >= (signed) len)
{
	end = len - 1;
	newlen = ( start > end ) ? 0 : ( end - start ) + 1;
}
}
else
{
start = 0;
}
if (start && newlen)
{
memmove( sh->buf , sh->buf + start , newlen );
}
sh->buf[newlen] = 0;
sh->free = sh->free + ( sh->len - newlen );
sh->len = newlen;
}

/* Apply tolower() to every character of the sds string 's'. */
void sdstolower( sds s )
{
int len = sdslen( s ),j;
for (j = 0; j < len; j++)
{
s[j] = tolower( s[j] );
}
}

/* Apply toupper() to every character of the sds string 's'. */
void sdstoupper( sds s )
{
int len = sdslen( s ),j;
for (j = 0; j < len; j++)
{
s[j] = toupper( s[j] );
}
}

/* Compare two sds strings s1 and s2 with memcmp().
 *
 * Return value:
 *
 *     positive if s1 > s2.
 *     negative if s1 < s2.
 *     0 if s1 and s2 are exactly the same binary string.
 *
 * If two strings share exactly the same prefix, but one of the two has
 * additional characters, the longer string is considered to be greater than
 * the smaller one. */
int sdscmp( const sds s1 , const sds s2 )
{
size_t l1,l2,minlen;
int cmp;
l1 = sdslen( s1 );
l2 = sdslen( s2 );
minlen = ( l1 < l2 ) ? l1 : l2;
cmp = memcmp( s1 , s2 , minlen );
if (cmp == 0)
{
return l1 - l2;
}
return cmp;
}

/* Split 's' with separator in 'sep'. An array
 * of sds strings is returned. *count will be set
 * by reference to the number of tokens returned.
 *
 * On out of memory, zero length string, zero length
 * separator, NULL is returned.
 *
 * Note that 'sep' is able to split a string using
 * a multi-character separator. For example
 * sdssplit("foo_-_bar","_-_"); will return two
 * elements "foo" and "bar".
 *
 * This version of the function is binary-safe but
 * requires length arguments. sdssplit() is just the
 * same function but for zero-terminated strings.
 */
sds *sdssplitlen( const char *s , int len , const char *sep , int seplen , int *count )
{
int elements = 0,slots = 5,start = 0,j;
sds *tokens;
if (seplen < 1 || len < 0)
{
return NULL;
}
tokens = zmalloc( sizeof(sds) * slots );
if (tokens == NULL)
{
return NULL;
}
if (len == 0)
{
*count = 0;
return tokens;
}
for (j = 0; j < ( len - ( seplen - 1 ) ); j++)
{
/* make sure there is room for the next element and the final one */
if (slots < elements + 2)
{
	sds *newtokens;
	slots *= 2;
	newtokens = zrealloc( tokens , sizeof(sds) * slots );
	if (newtokens == NULL)
	{
		goto cleanup;
	}
	tokens = newtokens;
}
/* search the separator */
if (( seplen == 1 && *( s + j ) == sep[0] ) || ( memcmp( s + j , sep , seplen ) == 0 ))
{
	tokens[elements] = sdsnewlen( s + start , j - start );
	if (tokens[elements] == NULL)
	{
		goto cleanup;
	}
	elements++;
	start = j + seplen;
	j = j + seplen - 1; /* skip the separator */
}
}
/* Add the final element. We are sure there is room in the tokens array. */
tokens[elements] = sdsnewlen( s + start , len - start );
if (tokens[elements] == NULL)
{
goto cleanup;
}
elements++;
*count = elements;
return tokens;
cleanup:
{
int i;
for (i = 0; i < elements; i++)
{
	sdsfree( tokens[i] );
}
zfree( tokens );
*count = 0;
return NULL;
}
}

/* Free the result returned by sdssplitlen(), or do nothing if 'tokens' is NULL. */
void sdsfreesplitres( sds *tokens , int count )
{
if (!tokens)
{
return;
}
while (count--)
{
sdsfree( tokens[count] );
}
zfree( tokens );
}

/* Append to the sds string "s" an escaped string representation where
 * all the non-printable characters (tested with isprint()) are turned into
 * escapes in the form "\n\r\a...." or "\x<hex-number>".
 *
 * After the call, the modified sds string is no longer valid and all the
 * references must be substituted with the new pointer returned by the call. */
sds sdscatrepr( sds s , const char *p , size_t len )
{
s = sdscatlen( s , "\"" , 1 );
while (len--)
{
switch (*p)
{
	case '\\':
		case '"':
		s = sdscatprintf( s , "\\%c" , *p );
	break;
	case '\n':
		s = sdscatlen( s , "\\n" , 2 );
	break;
	case '\r':
		s = sdscatlen( s , "\\r" , 2 );
	break;
	case '\t':
		s = sdscatlen( s , "\\t" , 2 );
	break;
	case '\a':
		s = sdscatlen( s , "\\a" , 2 );
	break;
	case '\b':
		s = sdscatlen( s , "\\b" , 2 );
	break;
	default:
		if (isprint( *p ))
		{
			s = sdscatprintf( s , "%c" , *p );
		}
		else
		{
			s = sdscatprintf( s , "\\x%02x" , (unsigned char) *p );
		}
	break;
}
p++;
}
return sdscatlen( s , "\"" , 1 );
}

/* Helper function for sdssplitargs() that returns non zero if 'c'
 * is a valid hex digit. */
int is_hex_digit( char c )
{
return ( c >= '0' && c <= '9' ) || ( c >= 'a' && c <= 'f' ) ||
	( c >= 'A' && c <= 'F' );
}

/* Helper function for sdssplitargs() that converts a hex digit into an
 * integer from 0 to 15 */
int hex_digit_to_int( char c )
{
switch (c)
{
case '0':
	return 0;
case '1':
	return 1;
case '2':
	return 2;
case '3':
	return 3;
case '4':
	return 4;
case '5':
	return 5;
case '6':
	return 6;
case '7':
	return 7;
case '8':
	return 8;
case '9':
	return 9;
case 'a':
	case 'A':
	return 10;
case 'b':
	case 'B':
	return 11;
case 'c':
	case 'C':
	return 12;
case 'd':
	case 'D':
	return 13;
case 'e':
	case 'E':
	return 14;
case 'f':
	case 'F':
	return 15;
default:
	return 0;
}
}

/* Split a line into arguments, where every argument can be in the
 * following programming-language REPL-alike form:
 *
 * foo bar "newline are supported\n" and "\xff\x00otherstuff"
 *
 * The number of arguments is stored into *argc, and an array
 * of sds is returned.
 *
 * The caller should free the resulting array of sds strings with
 * sdsfreesplitres().
 *
 * Note that sdscatrepr() is able to convert back a string into
 * a quoted string in the same format sdssplitargs() is able to parse.
 *
 * The function returns the allocated tokens on success, even when the
 * input string is empty, or NULL if the input contains unbalanced
 * quotes or closed quotes followed by non space characters
 * as in: "foo"bar or "foo'
 */
sds *sdssplitargs( const char *line , int *argc )
{
const char *p = line;
char *current = NULL;
char **vector = NULL;
*argc = 0;
while (1)
{
/* skip blanks */
while (*p && isspace( *p ))
{
	p++;
}
if (*p)
{
	/* get a token */
	int inq = 0; /* set to 1 if we are in "quotes" */
	int insq = 0; /* set to 1 if we are in 'single quotes' */
	int done = 0;
	if (current == NULL)
	{
		current = sdsempty();
	}
	while (!done)
	{
		if (inq)
		{
			if (*p == '\\' && *( p + 1 ) == 'x' &&
					is_hex_digit( *( p + 2 ) ) &&
					is_hex_digit( *( p + 3 ) ))
			{
				unsigned char byte;
				byte = ( hex_digit_to_int( *( p + 2 ) ) * 16 ) +
						hex_digit_to_int( *( p + 3 ) );
				current = sdscatlen( current , (char*) &byte , 1 );
				p += 3;
			}
			else if (*p == '\\' && *( p + 1 ))
			{
				char c;
				p++;
				switch (*p)
				{
					case 'n':
						c = '\n';
					break;
					case 'r':
						c = '\r';
					break;
					case 't':
						c = '\t';
					break;
					case 'b':
						c = '\b';
					break;
					case 'a':
						c = '\a';
					break;
					default:
						c = *p;
					break;
				}
				current = sdscatlen( current , &c , 1 );
			}
			else if (*p == '"')
			{
				/* closing quote must be followed by a space or
				 * nothing at all. */
				if (*( p + 1 ) && !isspace( *( p + 1 ) ))
				{
					goto err;
				}
				done = 1;
			}
			else if (!*p)
			{
				/* unterminated quotes */
				goto err;
			}
			else
			{
				current = sdscatlen( current , p , 1 );
			}
		}
		else if (insq)
		{
			if (*p == '\\' && *( p + 1 ) == '\'')
			{
				p++;
				current = sdscatlen( current , "'" , 1 );
			}
			else if (*p == '\'')
			{
				/* closing quote must be followed by a space or
				 * nothing at all. */
				if (*( p + 1 ) && !isspace( *( p + 1 ) ))
				{
					goto err;
				}
				done = 1;
			}
			else if (!*p)
			{
				/* unterminated quotes */
				goto err;
			}
			else
			{
				current = sdscatlen( current , p , 1 );
			}
		}
		else
		{
			switch (*p)
			{
				case ' ':
					case '\n':
					case '\r':
					case '\t':
					case '\0':
					done = 1;
				break;
				case '"':
					inq = 1;
				break;
				case '\'':
					insq = 1;
				break;
				default:
					current = sdscatlen( current , p , 1 );
				break;
			}
		}
		if (*p)
		{
			p++;
		}
	}
	/* add the token to the vector */
	vector = zrealloc( vector , ( ( *argc ) + 1 ) * sizeof(char*) );
	vector[*argc] = current;
	( *argc )++;
	current = NULL;
}
else
{
	/* Even on empty input string return something not NULL. */
	if (vector == NULL)
	{
		vector = zmalloc( sizeof(void*) );
	}
	return vector;
}
}
err:
while (( *argc )--)
{
sdsfree( vector[*argc] );
}
zfree( vector );
if (current)
{
sdsfree( current );
}
*argc = 0;
return NULL;
}

/* Modify the string substituting all the occurrences of the set of
 * characters specified in the 'from' string to the corresponding character
 * in the 'to' array.
 *
 * For instance: sdsmapchars(mystring, "ho", "01", 2)
 * will have the effect of turning the string "hello" into "0ell1".
 *
 * The function returns the sds string pointer, that is always the same
 * as the input pointer since no resize is needed. */
sds sdsmapchars( sds s , const char *from , const char *to , size_t setlen )
{
size_t j,i,l = sdslen( s );
for (j = 0; j < l; j++)
{
for (i = 0; i < setlen; i++)
{
	if (s[j] == from[i])
	{
		s[j] = to[i];
		break;
	}
}
}
return s;
}

/* Join an array of C strings using the specified separator (also a C string).
 * Returns the result as an sds string. */
sds sdsjoin( char **argv , int argc , char *sep )
{
sds join = sdsempty();
int j;
for (j = 0; j < argc; j++)
{
join = sdscat( join , argv[j] );
if (j != argc - 1)
{
	join = sdscat( join , sep );
}
}
return join;
}

#ifdef SDS_TEST_MAIN
#include <stdio.h>
#include "testhelp.h"
#include "limits.h"

int main(void)
{
{
struct sdshdr *sh;
sds x = sdsnew("foo"), y;
test_cond("Create a string and obtain the length",
		sdslen(x) == 3 && memcmp(x,"foo\0",4) == 0)
sdsfree(x);
x = sdsnewlen("foo",2);
test_cond("Create a string with specified length",
		sdslen(x) == 2 && memcmp(x,"fo\0",3) == 0)
x = sdscat(x,"bar");
test_cond("Strings concatenation",
		sdslen(x) == 5 && memcmp(x,"fobar\0",6) == 0);
x = sdscpy(x,"a");
test_cond("sdscpy() against an originally longer string",
		sdslen(x) == 1 && memcmp(x,"a\0",2) == 0)
x = sdscpy(x,"xyzxxxxxxxxxxyyyyyyyyyykkkkkkkkkk");
test_cond("sdscpy() against an originally shorter string",
		sdslen(x) == 33 &&
		memcmp(x,"xyzxxxxxxxxxxyyyyyyyyyykkkkkkkkkk\0",33) == 0)
sdsfree(x);
x = sdscatprintf(sdsempty(),"%d",123);
test_cond("sdscatprintf() seems working in the base case",
		sdslen(x) == 3 && memcmp(x,"123\0",4) == 0)
sdsfree(x);
x = sdsnew("--");
x = sdscatfmt(x, "Hello %s World %I,%I--", "Hi!", LLONG_MIN,LLONG_MAX);
test_cond("sdscatfmt() seems working in the base case",
		sdslen(x) == 60 &&
		memcmp(x,"--Hello Hi! World -9223372036854775808,"
				"9223372036854775807--",60) == 0)
sdsfree(x);
x = sdsnew("--");
x = sdscatfmt(x, "%u,%U--", UINT_MAX, ULLONG_MAX);
test_cond("sdscatfmt() seems working with unsigned numbers",
		sdslen(x) == 35 &&
		memcmp(x,"--4294967295,18446744073709551615--",35) == 0)
sdsfree(x);
x = sdsnew("xxciaoyyy");
sdstrim(x,"xy");
test_cond("sdstrim() correctly trims characters",
		sdslen(x) == 4 && memcmp(x,"ciao\0",5) == 0)
y = sdsdup(x);
sdsrange(y,1,1);
test_cond("sdsrange(...,1,1)",
		sdslen(y) == 1 && memcmp(y,"i\0",2) == 0)
sdsfree(y);
y = sdsdup(x);
sdsrange(y,1,-1);
test_cond("sdsrange(...,1,-1)",
		sdslen(y) == 3 && memcmp(y,"iao\0",4) == 0)
sdsfree(y);
y = sdsdup(x);
sdsrange(y,-2,-1);
test_cond("sdsrange(...,-2,-1)",
		sdslen(y) == 2 && memcmp(y,"ao\0",3) == 0)
sdsfree(y);
y = sdsdup(x);
sdsrange(y,2,1);
test_cond("sdsrange(...,2,1)",
		sdslen(y) == 0 && memcmp(y,"\0",1) == 0)
sdsfree(y);
y = sdsdup(x);
sdsrange(y,1,100);
test_cond("sdsrange(...,1,100)",
		sdslen(y) == 3 && memcmp(y,"iao\0",4) == 0)
sdsfree(y);
y = sdsdup(x);
sdsrange(y,100,100);
test_cond("sdsrange(...,100,100)",
		sdslen(y) == 0 && memcmp(y,"\0",1) == 0)
sdsfree(y);
sdsfree(x);
x = sdsnew("foo");
y = sdsnew("foa");
test_cond("sdscmp(foo,foa)", sdscmp(x,y) > 0)
sdsfree(y);
sdsfree(x);
x = sdsnew("bar");
y = sdsnew("bar");
test_cond("sdscmp(bar,bar)", sdscmp(x,y) == 0)
sdsfree(y);
sdsfree(x);
x = sdsnew("aar");
y = sdsnew("bar");
test_cond("sdscmp(bar,bar)", sdscmp(x,y) < 0)
sdsfree(y);
sdsfree(x);
x = sdsnewlen("\a\n\0foo\r",7);
y = sdscatrepr(sdsempty(),x,sdslen(x));
test_cond("sdscatrepr(...data...)",
		memcmp(y,"\"\\a\\n\\x00foo\\r\"",15) == 0)
{	
	int oldfree;
	sdsfree(x);
	sdsfree(y);
	x = sdsnew("0");
	sh = (void*) (x-(sizeof(struct sdshdr)));
	test_cond("sdsnew() free/len buffers", sh->len == 1 && sh->free == 0);
	x = sdsMakeRoomFor(x,1);
	sh = (void*) (x-(sizeof(struct sdshdr)));
	test_cond("sdsMakeRoomFor()", sh->len == 1 && sh->free > 0);
	oldfree = sh->free;
	x[1] = '1';
	sdsIncrLen(x,1);
	test_cond("sdsIncrLen() -- content", x[0] == '0' && x[1] == '1');
	test_cond("sdsIncrLen() -- len", sh->len == 2);
	test_cond("sdsIncrLen() -- free", sh->free == oldfree-1);
	sdsfree(x);
}
}
test_report()
return 0;
}
#endif

